<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <div class="app">
    <h3>{{ msg }}</h3>
    <hr>
    <input v-model='msg'>
  </div>
  
  <script src="./js/vue.js"></script>
  <script>
    const app=new Vue({
      el:'.app',
      data:{
        msg:'我现在来学习vue.js',
        id:238745274,
        name:'hdsgf'
      }
    })
  </script>
</body>
</html>